Days Sixteen & Seventeen: Not-so-Fixed, Not-so-Firm

I'm really concentrating on my Fixed Firm posture these days... it took a very long time for me to be able to get all the way down onto the floor and now I'm trying to alleviate some of the compression and pain in my lower back when I do so. Any suggestions (except don't tell me to open my knees wider... they're pretty much at the max already!) would be greatly appreciated!